Numerous false positives with v6.0.0
Dependency Check v6.0.0 was released today, and initial checks show a lot of false positives, e.g. the [`pagean` report](https://gitlab.com/gitlab-ci-utils/pagean/-/jobs/725168634) shows 36 new vulnerabilities vs 0 when [run under 5.3.2](https://gitlab.com/gitlab-ci-utils/pagean/-/jobs/723382175). See: - https://github.com/jeremylong/DependencyCheck/issues/2796 - https://github.com/jeremylong/DependencyCheck/issues/2794 Until this is resolved, pin `Dockerfile` at 5.3.2
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